# US 12,191,826 B2 · Method for adjusting power amplifier impedance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,826 B2 - Document ID: US12191826B2 - Status: Granted - Kind: B2 - Application number: 17/448,663 - Filed: 2021-09-23 - Published: 2022-03-31 - Granted: 2025-01-07 - Earliest claimed: 2020-09-29 - Assignees: Skyworks Solutions, Inc. - Applicants: Skyworks Solutions, Inc. - Inventors: William J. Domino; Craig Joseph Christmas; Joseph Anton Pusl, III; René Rodríguez - Web page: https://patentgrep.com/patent/US12191826B2 ## CPC - H03F 3/245: {with semiconductor devices only} - H03F 1/56: Modifications of input or output impedances, not otherwise provided for - H03F 1/565: {using inductive elements} - H03F 3/195: in integrated circuits - H03H 7/38: Impedance-matching networks - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H03F 2200/387: A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier - H03F 2200/451: the amplifier being a radio frequency amplifier - H03H 2007/386: {Multiple band impedance matching} - H03F: AMPLIFIERS - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H04B: TRANSMISSION ## Abstract A method of adjusting an impedance of a power amplifier of a radio frequency system for matching with an antenna switch die is disclosed. In one aspect, the method includes connecting the power amplifier to the antenna switch die via an impedance adjustment circuit, the impedance adjustment circuit including an input node, an output node, a plurality of electrical components arranged between the input node and the output node, and at least one switch configured to selectively electrically connect at least one of the electrical components to the input node and the output node. The method further includes determining an Error Vector Magnitude of the radio frequency system for each of a plurality of states of the at least one switch, and controlling the at least one switch to enter the state of the plurality of states that minimizes the Error Vector Magnitude of the radio frequency system. ## Claims ### Claim 1 A method of adjusting an impedance of a power amplifier of a radio frequency system for matching with a switch die, the method comprising: connecting the power amplifier to the switch die via an impedance adjustment circuit, the impedance adjustment circuit including an input node configured to receive a radio frequency signal from the power amplifier, an output node configured to provide the radio frequency signal to the switch die, a plurality of electrical components arranged between the input node and the output node, and at least one switch configured to selectively electrically connect at least one of the electrical components to the input node and the output node; determining a level of distortion of the radio frequency system for each of a plurality of states of the at least one switch; and controlling the at least one switch to enter the state of the plurality of states that minimizes the level of distortion of the radio frequency system. ### Claim 2 (depends on 1) The method of claim 1 wherein the plurality of states of the at least one switch include four states that respectively define four tuned impedance points when viewed on a Smith chart, and the at least four tuned impedance points surround a target tuned impedance point of the radio frequency system. ### Claim 3 (depends on 1) The method of claim 1 wherein the plurality of electrical components include at least one series element and at least one shunt element. ### Claim 4 (depends on 3) The method of claim 3 wherein the at least one series element includes a first inductor and a second inductor and the at least one shunt element includes a first capacitor and a second capacitor. ### Claim 5 (depends on 4) The method of claim 4 wherein the impedance adjustment circuit further includes a trace that includes a first branch and a second branch, the trace is formed on multi-chip-module, and the first branch is formed to provide the first inductor and the second branch is formed to provide the second inductor. ### Claim 6 (depends on 4) The method of claim 4 wherein the first capacitor and the second capacitor are formed as metal insulator metal capacitors on the switch die. ### Claim 7 (depends on 4) The method of claim 4 wherein the first inductor is electrically connected between the input and output nodes and the at least one switch includes a first switch configured to selectively connect the second inductor between the input and output nodes. ### Claim 8 (depends on 4) The method of claim 4 wherein the second capacitor is electrically connected between the output node and ground and the at least one switch includes a second switch configured to selectively connect the first capacitor between the output node and ground. ### Claim 9 (depends on 1) The method of claim 1 wherein the plurality of states include at least four tuned impedance points when viewed on a Smith chart, and the at least four tuned impedance points surround a target tuned impedance point of the power amplifier. ### Claim 10 (depends on 9) The method of claim 9 wherein the impedance adjustment circuit is included as part of a radio frequency system including the power amplifier and the switch die. ### Claim 11 A method comprising: connecting a power amplifier to a switch die via an impedance adjustment circuit, the impedance adjustment circuit including an input node configured to receive a radio frequency signal from the power amplifier, an output node configured to provide the radio frequency signal to the switch die, a plurality of electrical components arranged between the input node and the output node, and at least one switch configured to selectively electrically connect at least one of the electrical components to the input node and the output node; and adjusting an impedance of the power amplifier by selecting one of a plurality of states of the at least one switch, each state of the plurality of states corresponding to an adjustment of an impedance of the power amplifier from a natural tune point in a direction towards a target tuned impedance point when viewed on a Smith chart. ### Claim 12 (depends on 11) The method of claim 11 wherein the plurality of states of the at least one switch include four states that respectively define four tuned impedance points when viewed on the Smith chart, and the at least four tuned impedance points surround a target tuned impedance point of a radio frequency system. ### Claim 13 (depends on 11) The method of claim 11 wherein the plurality of electrical components include at least one series element and at least one shunt element. ### Claim 14 (depends on 13) The method of claim 13 wherein the at least one series element includes a first inductor and a second inductor and the at least one shunt element includes a first capacitor and a second capacitor. ### Claim 15 (depends on 14) The method of claim 14 wherein the impedance adjustment circuit further includes a trace that includes a first branch and a second branch, the trace is formed on multi-chip-module, and the first branch is formed to provide the first inductor and the second branch is formed to provide the second inductor. ### Claim 16 (depends on 14) The method of claim 14 wherein the first capacitor and the second capacitor are formed as metal insulator metal capacitors on the switch die. ### Claim 17 (depends on 14) The method of claim 14 wherein the first inductor is electrically connected between the input and output nodes and the at least one switch includes a first switch configured to selectively connect the second inductor between the input and output nodes. ### Claim 18 (depends on 14) The method of claim 14 wherein the second capacitor is electrically connected between the output node and ground and the at least one switch includes a second switch configured to selectively connect the first capacitor between the output node and ground. ### Claim 19 (depends on 11) The method of claim 11 wherein the plurality of states include at least four tuned impedance points when viewed on the Smith chart, and the at least four tuned impedance points surround a target tuned impedance point of the power amplifier. ### Claim 20 (depends on 19) The method of claim 19 wherein the impedance adjustment circuit is included as part of a radio frequency system including the power amplifier and the switch die.